/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.replica.replicaisland;

/**
 * A component that allows a game object to act like a solid object by
 * submitting surfaces to the background collision system every frame.
 */
public class SolidSurfaceComponent extends GameComponent {
	private FixedSizeArray<Vector2> mStartPoints;
	private FixedSizeArray<Vector2> mEndPoints;
	private FixedSizeArray<Vector2> mNormals;
	private Vector2 mStart;
	private Vector2 mEnd;
	private Vector2 mNormal;

	public SolidSurfaceComponent(int maxSurfaceCount) {
		super();

		inititalize(maxSurfaceCount);

		mStart = new Vector2();
		mEnd = new Vector2();
		mNormal = new Vector2();

		setPhase(ComponentPhases.POST_COLLISION.ordinal());
		reset();
	}

	@Override
	public void reset() {
		mStartPoints.clear();
		mEndPoints.clear();
		mNormals.clear();
	}

	public SolidSurfaceComponent() {
		super();

		mStart = new Vector2();
		mEnd = new Vector2();
		mNormal = new Vector2();

		setPhase(ComponentPhases.POST_COLLISION.ordinal());
	}

	public void inititalize(int maxSurfaceCount) {
		if (mStartPoints == null
				|| (mStartPoints != null && mStartPoints.getCount() != maxSurfaceCount)) {
			mStartPoints = new FixedSizeArray<Vector2>(maxSurfaceCount);
			mEndPoints = new FixedSizeArray<Vector2>(maxSurfaceCount);
			mNormals = new FixedSizeArray<Vector2>(maxSurfaceCount);
		}

		mStartPoints.clear();
		mEndPoints.clear();
		mNormals.clear();
	}

	// Note that this function keeps direct references to the arguments it is
	// passed.
	public void addSurface(Vector2 startPoint, Vector2 endPoint, Vector2 normal) {
		mStartPoints.add(startPoint);
		mEndPoints.add(endPoint);
		mNormals.add(normal);
	}

	@Override
	public void update(float timeDelta, BaseObject parent) {
		CollisionSystem collision = sSystemRegistry.collisionSystem;

		final FixedSizeArray<Vector2> startPoints = mStartPoints;
		final FixedSizeArray<Vector2> endPoints = mEndPoints;
		final FixedSizeArray<Vector2> normals = mNormals;

		final int surfaceCount = startPoints.getCount();
		if (collision != null && surfaceCount > 0) {
			GameObject parentObject = (GameObject) parent;
			final Vector2 position = parentObject.getPosition();
			Vector2 start = mStart;
			Vector2 end = mEnd;
			Vector2 normal = mNormal;

			for (int x = 0; x < surfaceCount; x++) {
				start.set(startPoints.get(x));
				if (parentObject.facingDirection.x < 0.0f) {
					start.flipHorizontal(parentObject.width);
				}

				if (parentObject.facingDirection.y < 0.0f) {
					start.flipVertical(parentObject.height);
				}
				start.add(position);

				end.set(endPoints.get(x));
				if (parentObject.facingDirection.x < 0.0f) {
					end.flipHorizontal(parentObject.width);
				}

				if (parentObject.facingDirection.y < 0.0f) {
					end.flipVertical(parentObject.height);
				}
				end.add(position);

				normal.set(normals.get(x));
				if (parentObject.facingDirection.x < 0.0f) {
					normal.flipHorizontal(0);
				}

				if (parentObject.facingDirection.y < 0.0f) {
					normal.flipVertical(0);
				}

				collision.addTemporarySurface(start, end, normal, parentObject);
			}

		}
	}

}
